diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..84f5661
Binary files /dev/null and b/.DS_Store differ
diff --git a/assets/dictionary-english.csv b/assets/dictionary-english.csv
index ce59890..809ea6c 100644
--- a/assets/dictionary-english.csv
+++ b/assets/dictionary-english.csv
@@ -1,4 +1,3 @@
-Word
 a
 aa
 aaa
diff --git a/lib/adagrams.rb b/lib/adagrams.rb
index e69de29..d4dd3e1 100644
--- a/lib/adagrams.rb
+++ b/lib/adagrams.rb
@@ -0,0 +1,102 @@
+require 'csv'
+
+# Wave 1
+# Draws ten letters for the user.
+def draw_letters
+  # Variable holding our pool of letters.
+  letters_pool = %w(A A A A A A A A A B B C C D D D D E E E E E E E E E E E E F F G G G H H I I I I I I I I I J K L L L L M M N N N N N N O O O O O O O O P P Q R R R R R R S S S S T T T T T T U U U U V V W W X Y Y Z)
+  # Variable holding the letters passed to the user.
+  hand = []
+
+  10.times do
+    hand << letters_pool.sample
+  end
+
+  return hand
+end
+
+# Wave 2
+# Checks if the word the user inputs is available in letters in hand.
+def uses_available_letters?(input, letters_in_hand)
+  input_letters = input.upcase.split('') # Variable holding array of letters of chosen word.
+  
+  letters_in_hand.each do |letter|
+    if input_letters.include?(letter)
+      input_letters.delete_at(input_letters.index(letter))
+    end
+  end
+
+  input_letters.empty? ? true : false
+end
+
+# Wave 3
+# Scores the word that the user has inputted.
+def score_word(word)
+  # Variable holding individual letters of chosen word.
+  letters = word.upcase.split('')
+  # Variable tracking the score of the word.
+  score = 0
+
+  score_table = {
+    1 => ['A', 'E', 'I', 'O', 'U', 'L', 'N', 'R', 'S', 'T'],
+    2 => ['D', 'G'],
+    3 => ['B', 'C', 'M', 'P'],
+    4 => ['F', 'H', 'V', 'W', 'Y'],
+    5 => ['K'],
+    8 => ['J', 'X'],
+    10 => ['Q', 'Z']
+  }
+
+  letters.each do |letter|
+    score_table.each do |score_value, letter_array|
+        score += score_value.to_i if letter_array.include?(letter)
+    end
+  end
+  # If the chosen word is greater in length than 7 but less than 10,
+  # 8 more points will be added to their score.
+  score += 8 if (letters.length >= 7 && letters.length <= 10)
+
+  return score
+end
+
+# Wave 4
+# Chooses the highest scoring word from all words inputted.
+def highest_score_from(words)
+  highest_word = "" # Variable tracking word that scores the highest.
+  highest_scored = 0 # Variable tracking the highest score.
+
+  words.each do |word|
+    score = score_word(word)
+
+    if score > highest_scored
+      highest_scored = score
+      highest_word = word
+    # In case of a tie
+    elsif score == highest_scored
+      highest_word = tiebreaker(highest_word, word)
+    end
+  end
+
+  return {word: highest_word, score: highest_scored}
+end
+
+# Breaks the tie.
+def tiebreaker(highest_word, word)
+  case
+    when highest_word.length == 10 && word.length != 10
+      highest_word
+    when word.length == 10 && highest_word.length != 10
+      highest_word = word
+    when word.length < highest_word.length
+      highest_word = word
+  end
+
+  return highest_word
+end
+
+# Wave 5
+# Checks if input is a valid word in the English Dictionary.
+def is_in_english_dict?(input)
+  dictionary = File.open('assets/dictionary-english.csv').readlines.map(&:chomp)
+  dictionary.include?(input) ? true : false
+end
\ No newline at end of file
diff --git a/test/adagrams_test.rb b/test/adagrams_test.rb
index 90ec44d..6600de2 100644
--- a/test/adagrams_test.rb
+++ b/test/adagrams_test.rb
@@ -178,4 +178,12 @@
       expect(best_word[:score]).must_equal 18
     end
   end
+  describe "is_in_english_dict method" do
+    it "checks if word is in english dictionary" do
+      #verify that 'anything' is in the dictionary
+      expect(is_in_english_dict?("anything")).must_equal true
+      #verify that our made up word is in the dictionary
+      expect(is_in_english_dict?("33aer")).must_equal false
+    end
+  end
 end
diff --git a/wave-4-game.rb b/wave-4-game.rb
index 958dc10..a003f77 100644
--- a/wave-4-game.rb
+++ b/wave-4-game.rb
@@ -75,4 +75,4 @@ def run_game
   display_goodbye_message
 end
 
-run_game
+run_game
\ No newline at end of file